Features; Outline Of The Ycc-S (Yamaha Chip Controlled-Shift) System - Yamaha 2006 FJR1300AS Service Manual

FEATURES

EAS20170
FEATURES
ET2D21013

OUTLINE OF THE YCC-S (Yamaha Chip Controlled-Shift) SYSTEM

Concept
YCC-S offers more enjoyable and easy riding by eliminating the need for the user to operate the clutch,
which also reduces fatigue during long touring.
YCC-S is not an automatic transmission, although it allows the user to shift gears by foot or hand ac-
cording to preference.
When shifting, a signal is sent to the MCU (motor control unit), which ensures optimum clutch operation,
shifting, and engine control. Therefore, the user never needs to operate the clutch, which in turn, reduc-
es fatigue and allows the user to concentrate while riding.
When stopping at traffic lights or in traffic jams, YCC-S operates the clutch instead of the user.
Basic function
To shift gears after starting the engine, the user must use the shift pedal. However, depending on the
user's preference, the transmission can be shifted by hand after setting the hand shift select button to
"ON".
When the engine is started, the MCU disengages the clutch. A signal is sent to the MCU when the trans-
mission is shifted from neutral to 1st gear by hand or foot. When the throttle is opened, the MCU then
engages the clutch according to engine r/min. Clutch engagement is controlled optimally by the MCU.
Clutch engagement is not constant in order to provide smooth shifting according to engine require-
ments and conditions.
The YCC-S system will not shift up if the engine r/min is lower than a specified value. Even if the user
shifts up, if the specified value is not met (engine r/min is too low), the YCC-S system will not shift up
until the above-mentioned specified value is met.
Likewise, the YCC-S system will not shift down if the specified value is not met (engine r/min is too
high).
In this case, the throttle must be closed so that the MCU can disengage the clutch until the specified
value is met to prevent the engine from stopping. During this period, a coasting condition will be felt.
The user must shift down properly in order for the YCC-S system to provide a smooth stopping condi-
tion.
The YCC-S system is constantly performing a self-diagnosis when the engine is running. If any trouble
is detected, the MCU automatically stops the YCC-S system and shifting is impossible.
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